Fujitsu Modulating Upflow Gas Furnace - FF***LM98 Series

Product Overview and Technical Specifications

Key Features

98% residential gas furnace CSA certified
Upflow configuration
Modulating operation for energy savings and optimal comfort
Variable speed blower motor for humidity control, quiet operation, and year-round energy savings
EcoNet enabled HVAC product
Diagnostics with 7-Segment LED
DSI Ignition System for reliability
Water Management System with patented Blocked Drain Sensor
Industry's highest AFUE Gas Furnace family (98% AFUE across all models)
Heat exchanger: Aluminized steel primary, stainless steel secondary for corrosion resistance
Low profile "34 inch" cabinet for space-constrained installations
Serviceable blower shelf design
Pre-marked hoses for proper system drainage
Ventable with 2" or 3" PVC
Replaceable collector box
Hemmed edges on cabinet and doors
Quarter turn door fasteners for tool-less access
Integrated control boards with dip switches for easy setup
Self-priming condensate trap
Solid bottom included
Optional: Communicating Control Center for fully communicating HVAC systems
Modulating Function: 40% to 100% capacity with compatible thermostat
Two-stage Function: 40%, 65%, 100% capacity with two-stage thermostat
Multistage Function: 40%, 65%, 100% capacity with single-stage thermostat
Cabinet air leakage less than 2% at 1 inch H2O (ASHRAE 193)

Specifications

Model Number	High Fire Input BTU/HR [kW]	Low Fire Input BTU/HR [kW]	Heating Capacity BTU/HR [kW]	Blower (D x W) [mm]	Motor H.P. [W]-Type	Min. Circuit Ampacity	Max. Overload Protection Device	Min. Ext. Static Pressure IN. W.C. [kPa]	Max. Ext. Static Pressure IN. W.C. [kPa]	Max. Heating CFM [L/s]	Cooling CFM @ .50" W.C. [.124 kPa] E.S.P. [L/s]	Temp Rise - High Fire °F [°C]	Temp Rise - Low Fire °F [°C]	Approx. Shipping Weight (LBS) [kg]	AFUE
FF60173LM98U	56,000 [16.41]	22,400 [6.56]	55,000 [16.12]	11 x 8 [279 x 203]	1/2 [373] E.C.M.	8.00	15.00	.20 [.050]	1.0 [0.249]	954 [450]	1050 [496]	40 - 70 [22 - 39]	20 - 50 [11 - 28]	128 [58]	98.7%
FF70173LM98U	70,000 [20.50]	28,000 [8.21]	69,000 [20.22]	11 x 8 [279 x 203]	1/2 [373] E.C.M.	9.00	15.00	.23 [.057]	1.0 [0.249]	1109 [524]	1050 [496]	40 - 70 [22 - 39]	20 - 50 [11 - 28]	132 [60]	98.3%
FF85215LM98U	84,000 [24.61]	33,600 [9.85]	83,000 [24.32]	11 x 10 [279 x 254]	3/4 [559] E.C.M.	12.00	20.00	.28 [.070]	1.0 [0.249]	1294 [611]	1750 [825]	40 - 70 [22 - 39]	20 - 50 [11 - 28]	147.5 [67]	98.1%
FF100215LM98U	98,000 [28.72]	39,000 [11.49]	97,000 [28.43]	11 x 10 [279 x 254]	3/4 [559] E.C.M.	13.00	20.00	.28 [.070]	1.0 [0.249]	1644 [776]	1750 [825]	40 - 70 [22 - 39]	25 - 55 [13 - 30]	152 [69]	98.1%
FF115245LM98U	112,000 [32.82]	44,800 [13.13]	110,000 [32.24]	11 x 11 [279 x 279]	3/4 [559] E.C.M.	12.00	20.00	.28 [.070]	1.0 [0.249]	1629 [769]	1750 [825]	45 - 75 [25 - 41]	20 - 50 [11 - 28]	165 [75]	98.6%

NOTES: All models are 115V, 60HZ, 1 phase. Gas connection size is 1/2" [13 mm] N.P.T. AFUE calculated per DOE test procedures. Standard models comply with California low NOx requirements. Special notes regarding NOx emissions limits and rebate eligibility for California are applicable.

Model Number Identification

The model number indicates specific features:

FF: Series designation
Capacity (e.g., 60, 70, 85, 100, 115): Represents thousands of BTU/HR input (e.g., 60 = 60,000 [17.58 kW])
Width (e.g., 17, 21, 24): Furnace width in inches
Airflow (e.g., 3, 5): Airflow capacity (3 = 3 Ton, 5 = 5 Ton)
Motor (e.g., L): L = ECM (Electronically Commutated Motor)
Speed (e.g., M): M = Modulating
Efficiency (e.g., 98): 98 = 98% AFUE
Orientation (e.g., U): U = Upflow

Dimensional Data and Clearances

The FF***LM98 series furnaces are designed for upflow installation. The cabinet dimensions and required clearances for combustible materials are provided below. [ ] Designates Metric Conversions.

Model	Top Clearance [mm]	Front Clearance [mm]	Approx. Ship Weight [kg]	Flange Dimensions A [mm]	Flange Dimensions B [mm]	Flange Dimensions C [mm]
060	1 [25]	2 [51]	58	445	413	412
070	1 [25]	2 [51]	60	445	413	412
085	1 [25]	2 [51]	67	533	502	500
100	1 [25]	2 [51]	69	533	502	500
115	1 [25]	2 [51]	75	662	591	589

Note: A service clearance of at least 24" [610 mm] is recommended in front of all furnaces. Supply and return are depicted as upflow configuration. Flange configuration may vary depending on installation orientation.

Diagram Description (Page 3): The diagram illustrates the internal components of the furnace, including the primary and secondary heat exchanger, modulating burners, pressure switches, control board, ECM motor, draft inducer, gas valve and manifold, and blocked drain sensor. It also shows the location of the remote sensor.

Diagram Description (Page 6): The diagrams show the external dimensions and connection points for the furnace from front, top, bottom, and side views. Key connection points include optional combustion air inlet, optional vent outlet, return air, optional condensate drain (upflow/downflow), gas connection, and electrical connections. Tables detail minimum clearances to combustibles and flange dimensions for various models.

Blower Performance Data

Heating CFM Options

Model Number	Low Heat (40%) [L/s]	Medium Heat (65%) [L/s]	High Heat (100%) [L/s]
FF60173LM98U	202	265	353
FF70173LM98U	220	300	411
FF85215LM98U	268	356	479
FF100215LM98U	257	404	609
FF115245LM98U	367	467	607

Cooling CFM Options

Model Number	High Cooling CFM [L/s]		Target Cooling/Heat Pump Airflow [L/s]		Low Cooling CFM [L/s]
Model Number	SW4=OFF, SW5=OFF	SW4=ON, SW5=OFF	SW4=OFF, SW5=ON	SW4=ON, SW5=ON	SW4=OFF, SW5=OFF	SW4=ON, SW5=OFF
FF60173LM98U	496	413	330	248	372	310
FF70173LM98U	496	413	330	248	372	310
FF85215LM98U	825	661	578	496	619	496
FF100215LM98U	825	661	578	496	619	496
FF115245LM98U	825	661	578	496	619	496

Note: Refer to Installation Manual for complete heating dip switch options.

Accessories

Vent Termination Kits: RXGY-E02, RXGY-E02A, RXGY-E03, RXGY-E03A, RXGY-G02
Combustion Air Drain Kits: RXGY-D05 (2"), RXGY-D06 (3")
Neutralizer Kit: RXGY-A01
Filter Racks (Upflow): RXGF-CB (Bottom), RXGF-CD (Side)
Indoor Coil Casings: RXBC-D17A1, RXBC-D21A1, RXBC-D21B1, RXBC-D24A1
High Altitude Kits: RXGY-F53 through RXGY-F57 (for specific models)
L.P. Conversion Kit: RXGJ-FP37
Condensate Pump Kit: PROSTOCK & 1PCB151TUL
Combustible Floor Base: RXGC-B17, RXGC-B21, RXGC-B24

Note: Modulating furnaces require a 2% derate at altitudes above 2,000 feet. See Installation Instructions.

EcoNet Control

The EcoNet Control Center (FETST601SYS) is recommended for optimal performance. It acts as a hub for heating, cooling, and water heating systems, enabling fully communicating HVAC operation.

Contractor Benefits:

Auto/Self Configuration
Day-at-a-glance scheduling, programmable fan
Intuitive wiring
Dual fuel ready
Optimized airflow
System status and mode information
Complete diagnostic information

Homeowner Benefits:

Large, easy-to-read icons and characters
Auto-mode control
Smart recovery
Continuous Fan Mode (5 speeds)
Humidity Control
Water heater, pool heater integration (check model compatibility)

EcoNet Control Accessories: Wall Plate = RCPN-AMC08. Available through PROSTOCK®.

Limited Warranty

Fujitsu General America, Inc. provides replacements for parts failing in normal use within the stated period, according to warranty terms.

Parts: Ten (10) Years
Heat Exchanger: Limited Lifetime
Conditional Unit Replacement (Registration Required): Limited Lifetime

For complete warranty details, contact your local contractor or the Manufacturer.

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